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Post subject: Rev trouble?
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KX3  Mmm, Fully Synthetic! Joined: 02 Oct 2006 Total posts: 1190 Location: Québec |
I just fitted zeeltronic cdi vcdi and ppv.
Amazing kit!
Now I'm faced with this problem:
everything is fine under hard acceleration up to 10000
but the engine won't run steadily over 7000.
If I keep the throttle at 7000 steadily, the engine rattles.
After it won't go over 6000 and runs like s**t but
after a while it will climb easily to 10000 until I try to run it steadily over 7000 
I really have no clue on that one 
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Posted: Mon Jun 23, 2008 9:10 pm
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Bare All-gear Wheelie! Joined: 28 Jan 2006 Total posts: 1909 Location: Vancouver Canada |
Yikes! that's a new one 2 things come to mind:
a) fuel starvation? As in not enough getting to the float bowls or the float bowls are maintiaing a steady supply. Float valves/float heights/ Fuel tap??
b) spark issue? try another curve?
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Posted: Tue Jun 24, 2008 3:35 pm
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Spike Daily Burner Joined: 25 Aug 2005 Total posts: 226 Location: Swiiiiiitzerland |
Interesting…
Rather than speak of RPM can you tell us about your throttle position?
I expect pretty much WFO but then you never know
Have you got a french word for "rattles"??
NB Je parle aussi français.
The term you're using might not be correct re: what you are describing in english.
Can you hear the "rattle" when you rev it cleanly to 10k? or is the "rattle" only when you back off from 10k to 7k? or if you accellerate to 7k from 0k, does the problem repeat?
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Posted: Tue Jun 24, 2008 3:43 pm
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KX3Mmm, Fully Synthetic! Joined: 02 Oct 2006 Total posts: 1190 Location: Québec |
Carbs were OK before I swapped the Yam bits for Zeeltronic...
A short question before I investigate further:
is it possible that a given ignition curve needs a different jetting?
I think the mixture is now too rich at 7K but I don't understand why
| Spike wrote: |
Can you hear the "rattle" when you rev it cleanly to 10k? or is the "rattle" only when you back off from 10k to 7k? or if you accellerate to 7k from 0k, does the problem repeat? |
I didn't notice because it's going VERY fast from 7 to 10 with Zeel ignition 
From 0 to 7 it's OK.
The problem appears when I keep the thorttle STEADY around 7k.
Throttle postion is somewhere in the last third...
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Posted: Thu Jun 26, 2008 8:56 pm
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ief Powerband Master Joined: 27 Jan 2004 Total posts: 777 Location: netherlands |
did you check your static angle ?
what curve are you using anyway?
as my zeeltronic is on it's way i'm anxious a bit so... 
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Posted: Thu Jun 26, 2008 9:21 pm
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KX3Mmm, Fully Synthetic! Joined: 02 Oct 2006 Total posts: 1190 Location: Québec |
| ief wrote: |
did you check your static angle ?
what curve are you using anyway?
as my zeeltronic is on it's way i'm anxious a bit so... |
It's a drilled rotor so I guess static angle is fixed to 34.6.
New crank has been fitted recently by someone I trust...
I use 31k curve, #5 in vcdi.
You'll love Borut's kit!
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Posted: Thu Jun 26, 2008 9:27 pm
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Post subject: Zeeltronic
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johnlcPowerband Master Joined: 14 Oct 2006 Total posts: 794 Location: John O'Groats |
Try swapping back over to standard kit for comparison to eliminate carbs
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Posted: Thu Jun 26, 2008 9:33 pm
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BareAll-gear Wheelie! Joined: 28 Jan 2006 Total posts: 1909 Location: Vancouver Canada |
[quote="KX3"][quote="ief"]d
It's a drilled rotor so I guess static angle is fixed to 34.6.
New crank has been fitted recently by someone I trust...
I use 31k curve, #5 in vcdi.
/quote]
Drilled?? rotor? how does that affect Your static angle?
Loving the Zeel ? ..But yr machine ain't exactly running right yet..
Is it? roll:
Happily mine is ..so far.. Zeel couldn't be better.. but it offers huge potential for destruction as well.
Initial thoughts were that yer fuel wasn't getting in under hi demand.. but the rattle is possibly an incorrect timings issue..although that does not self correct.. after a few mins.
Test .. fuel flow out of yr petcock?
Tuned engines often need a higher flow petcock... I errr.. 'enlarged' my petcocks passages during it's rebuild... dunno if it helped but there are no issues.
IMO Not prudent to take it to 10k.. the rings flutter and the crank doesn't like it much either... a problem compounded by our inaccurate tachs... they could be reading lhigh or even worse; too low. 
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Posted: Thu Jun 26, 2008 11:46 pm
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Post subject: Rev troubles
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johnlcPowerband Master Joined: 14 Oct 2006 Total posts: 794 Location: John O'Groats |
[quote]If I keep the throttle at 7000 steadily, the engine rattles.
After it won't go over 6000 and runs like s**t but [quote]
Actually it does seem like fuel starvation ,maybe fuel tap blocked .
When you say the engine rattles are you meaning backfiring or hesitating
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Posted: Fri Jun 27, 2008 5:15 am
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Post subject: Re: Rev troubles
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KX3Mmm, Fully Synthetic! Joined: 02 Oct 2006 Total posts: 1190 Location: Québec |
| johnlc wrote: |
Actually it does seem like fuel starvation ,maybe fuel tap blocked .
When you say the engine rattles are you meaning backfiring or hesitating |
It behaves like fuel starvation...but as I said, everything was fine the day before I fit the Zeel
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Posted: Fri Jun 27, 2008 9:28 pm
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Post subject: Re: Rev troubles
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iefPowerband Master Joined: 27 Jan 2004 Total posts: 777 Location: netherlands |
| KX3 wrote: |
| johnlc wrote: |
Actually it does seem like fuel starvation ,maybe fuel tap blocked .
When you say the engine rattles are you meaning backfiring or hesitating |
It behaves like fuel starvation...but as I said, everything was fine the day before I fit the Zeel |
or even worse; pre ignition?
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Posted: Fri Jun 27, 2008 11:28 pm
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Post subject: Re: Rev troubles
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jante350 RD/RZ Jedi Master Joined: 05 Aug 2003 Total posts: 5220 Location: Bergen, Norway |
| KX3 wrote: |
| johnlc wrote: |
Actually it does seem like fuel starvation ,maybe fuel tap blocked .
When you say the engine rattles are you meaning backfiring or hesitating |
It behaves like fuel starvation...but as I said, everything was fine the day before I fit the Zeel |
Not sure if its relevant, but ignition settings can affect the jetting somewhat if its not spot on...
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Posted: Sat Jun 28, 2008 11:49 am
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